Colored filters improve exclusion of perceptual noise in visually symptomatic dyslexics

Dyslexic individuals have deficits in detecting visual stimuli embedded in high levels of perceptual noise. Here we show that visually symptomatic dyslexics, who otherwise had elevated contrast thresholds for discriminating symbols in visual noise, had thresholds similar to non-dyslexics when wearing colored filters. These findings provide evidence that colored filters, which minimize the visual distortions and discomfort of dyslexics when reading, improve dyslexics' noise exclusion to normal levels

Retrenchment in British Universities: Lessons Learned

The 43 British universities conducted a mandated budget and enrollment retrenchment over the 1981-84 period. This exercise required that the universities achieve budget restrictions ranging as high as 40 percent. No major North American research university has in recent history been forced to undergo such a severe retrenchment. This presentation is a report of a four-month field study conducted by visiting 14 British universities, selected in part, by the size of their mandated reduction. The emphasis of this report is on successful policies, procedures, philosophies, and techniques that may be applicable to other institutions of higher education, irrespective of nationality

Using Functional Near Infrared Spectroscopy (fNIRS) to study dynamic stereoscopic depth perception

The parietal cortex has been widely implicated in the processing of depth perception by many neuroimaging studies, yet functional near infrared spectroscopy (fNIRS) has been an under-utilised tool to examine the relationship of oxy- ([HbO]) and de-oxyhaemoglobin ([HbR]) in perception. Here we examine the haemodynamic response (HDR) to the processing of induced depth stimulation using dynamic random-dot-stereograms (RDS). We used fNIRS to measure the HDR associated with depth perception in healthy young adults (n = 13, mean age 24). Using a blocked design, absolute values of [HbO] and [HbR] were recorded across parieto-occipital and occipital cortices, in response to dynamic RDS. Control and test images were identical except for the horizontal shift in pixels in the RDS that resulted in binocular disparity and induced the percept of a 3D sine wave that 'popped out' of the test stimulus. The control stimulus had zero disparity and induced a 'flat' percept. All participants had stereoacuity within normal clinical limits and successfully perceived the depth in the dynamic RDS. Results showed a significant effect of this complex visual stimulation in the right parieto-occipital cortex (p < 0.01, η(2) = 0.54). The test stimulus elicited a significant increase in [HbO] during depth perception compared to the control image (p < 0.001, 99.99 % CI [0.008-0.294]). The similarity between the two stimuli may have resulted in the HDR of the occipital cortex showing no significant increase or decrease of cerebral oxygenation levels during depth stimulation. Cerebral oxygenation measures of [HbO] confirmed the strong association of the right parieto-occipital cortex with processing depth perception. Our study demonstrates the validity of fNIRS to investigate [HbO] and [HbR] during high-level visual processing of complex stimuli

An exploration of interventions for healing intergeneration trauma to develop successful healing programs for Aboriginal Australians: A literature review

Introduction Health outcomes and life expectancy of Indigenous people throughout the world are far poorer than non-Indigenous populations. Emerging evidence from research shows that many social issues which impact on Indigenous peoples globally is linked to trauma over generations. This review explores literature about Indigenous people from around the world to seek interventions which have been successful in healing intergenerational trauma. Method To identify interventions that have been successful in healing intergenerational trauma amongst Indigenous populations globally, a systematic search strategy was conducted using keywords and synonyms related to the topic. Peer reviewed academic literature was sourced from four different databases i.e. Ebscohost, PubMed, CINAHL and Medline. Results There were 89 citations, 55 were identified as relevant, after duplicate copies were removed. Of these 55 papers, 23 met inclusion/exclusion criteria. Two additional papers from a reference lists were included and a total of 25 papers were analysed. A comprehensive critical appraisal of the literature was undertaken using three different appraisal tools. This review found that interventions which were successful in healing intergenerational trauma amongst Indigenous populations incorporated traditional cultural practices within their healing method(s). Discussion There was strong evidence that strengthening and reclaiming cultural identity enhances mental health disorders commonly experienced throughout Indigenous populations. Often non-Indigenous clinicians, although well intentioned, fail to address the needs of Indigenous people because they lack the understanding and awareness of Indigenous people’s culture. This review highlights benefits of blending Indigenous and Western approaches into healing intergenerational trauma and the concept of ‘Two-Eyed Seeing’. This concept acknowledges that each of our worlds has its strengths and if we respectfully and methodically accept these strengths, they can work together and effectively to bring about healing. Conclusion Healing from intergenerational trauma is not a straightforward process. Incorporating traditional healing methods assists in the development of cultural identity, which was found to be extremely important in the healing process. To address trauma effectively, clinicians need to acknowledge the historical impact from public policies by having a real understanding of our history

Irreducible odd representations of PSL(n, q)

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/22420/1/0000870.pd

Interactions of Poly(amidoamine) Dendrimers with Human Serum Albumin: Binding Constants and Mechanisms

The interactions of nanomaterials with plasma proteins have a significant impact on their in vivo transport and fate in biological fluids. This article discusses the binding of human serum albumin (HSA) to poly(amidoamine) [PAMAM] dendrimers. We use protein-coated silica particles to measure the HSA binding constants (K_b) of a homologous series of 19 PAMAM dendrimers in aqueous solutions at physiological pH (7.4) as a function of dendrimer generation, terminal group, and core chemistry. To gain insight into the mechanisms of HSA binding to PAMAM dendrimers, we combined ^1H NMR, saturation transfer difference (STD) NMR, and NMR diffusion ordered spectroscopy (DOSY) of dendrimer−HSA complexes with atomistic molecular dynamics (MD) simulations of dendrimer conformation in aqueous solutions. The binding measurements show that the HSA binding constants (K_b) of PAMAM dendrimers depend on dendrimer size and terminal group chemistry. The NMR ^1H and DOSY experiments indicate that the interactions between HSA and PAMAM dendrimers are relatively weak. The ^1H NMR STD experiments and MD simulations suggest that the inner shell protons of the dendrimers groups interact more strongly with HSA proteins. These interactions, which are consistently observed for different dendrimer generations (G0-NH_2vs G4-NH_2) and terminal groups (G4-NH_2vs G4-OH with amidoethanol groups), suggest that PAMAM dendrimers adopt backfolded configurations as they form weak complexes with HSA proteins in aqueous solutions at physiological pH (7.4)

Development of sampling efficiency and internal noise in motion detection and discrimination in school-aged children

AbstractThe aim of this study was to use an equivalent noise paradigm to investigate the development and maturation of motion perception, and how the underlying limitations of sampling efficiency and internal noise effect motion detection and direction discrimination in school-aged children (5–14years) and adults. Contrast energy thresholds of a 2c/deg sinusoidal grating drifting at 1.0 or 6.0Hz were measured as a function of added dynamic noise in three tasks: detection of a drifting grating; detection of the sum of two oppositely drifting gratings and direction discrimination of oppositely drifting gratings. Compared to the ideal observer, in both children and adults, the performance for all tasks was limited by reduced sampling efficiency and internal noise. However, the thresholds for discrimination of motion direction and detection of moving gratings show very different developmental profiles. Motion direction discrimination continues to improve after the age of 14years due to an increase in sampling efficiency that differs with speed. Motion detection and summation were already mature at the age of 5years, and internal noise was the same for all tasks. These findings were confirmed in a 1-year follow-up study on a group of children from the initial study. The results support suggestions that the detection of a moving pattern and discriminating motion direction are processed by different systems that may develop at different rates

Effect of Stroke on Fall Rate, Location and Predictors: A Prospective Comparison of Older Adults with and without Stroke

BACKGROUND: The literature suggests that stroke is a major risk factor for falls, but there is a lack of prospective, controlled studies which quantify fall-risk after stroke. The purpose of this study was to compare the rates, location and predictors among individuals recently discharged home from stroke rehabilitation to age and sex matched controls. METHODOLOGY/PRINCIPAL FINDINGS: A sample of 80 people with stroke and 90 controls received baseline assessments of balance, mobility and balance confidence. Falls were recorded prospectively over 13 months for both groups. Group differences in fall rates and contribution of clinical measures to falls were determined using negative binomial regression. Fall location was compared between groups using χ(2) statistics. The rate of falls for individuals with stroke was 1.77 times the rate for the control group. People with stroke were more likely to fall at home. Poorer balance (Berg Balance Scale) was associated with greater falls for both stroke and control groups (incidence rate ratio [IRR]: 0.908 and IRR: 0.877 respectively). A faster Timed Up and Go Test was associated with greater falls for the stroke group (IRR: 0.955) while better walking endurance (Six Minute Walk Test) was associated with greater falls for the controls (IRR: 1.004). Balance confidence was not an independent predictor in either group. CONCLUSIONS: Individuals recently discharged home are at greater risk of falling than individuals without stroke. Attention to home environment is warranted. Balance function can predict falls for both people with stroke and age and sex matched controls. Increased mobility may increase exposure to fall opportunities